Rivet-holding tool.



G. S. MONSUN.

RIVET HOLDIN-G TOOL.

APPucATmN FILED JAN.21, 191s.

35 3, into the narrower end of which is screwed GEORGE S. MONSON, OF SAN FRANCISCO, CALIFORNIA.

RIVET-HOLDING TOOL.

Application filed January 21, 1918.

To all w/wm t may concern.:

Be it known that I, GEORGE S. Monson, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new Y and useful Improvements in Rivet-Holding Tools, tion.

The present invention relates to an instrument for. holding rivets when riveting.

ivets are usually secured in structural metal by riveting machines, but when rivets are required to be afhxed in plates, such as those of torpedo boat destroyers, which are very thin, then riveting by machinery tends of which the following is a specificaf n, to bend or distort theplates, and it is neces- -f head.

sary to secure said yrivets by hand.

The object of the present invention is to provide an instrument for holding the rivets in place in the holes of the plates to be riveted together so that they can be swaged or riveted by hand, which will be easily and rapidly'adjusted to various locations of the rivets. and to variations in the pressure which it is desired to apply to the rivet In the accompanying drawing, Figure l is a top plan view of my improved rivet holder; Fig. 2 is a central longitudinal section thereof; Fig. 3 is a transverse section .y on the line 3-3 of Fig. 2.

Referring to the drawing, 1 indicates a tubular housing, threaded at its lower end, as shown at 2, and on said threaded end is screwed the wider end of a reducing union one end of a tube 4 of rany length which renders it suitable as an extension or support to rest against a plate or abutment 6.

Formed integrally with the tubular housing' i; 1, ,and on one side thereof, is a longitudinally extending rack 7 having a slot 8 between it and the housing and having outwardly andv forwardly extending teeth 10. Engaging in one of the notches 9 between f said teeth is a pivot pin 11, which extends also through the rear terminal portions of flat bars 12, and through the terminal portions of said pin 11 and extending outside said bars 12 are passed upwardly the side members 13 of a yoke 14, the middle portion of which yoke carries. a roller 16 which rolls in the slot 8. Springs 17 are coiled' around the side members of the yoke and are compressed between the terminal portions of the pin 11 and nuts 18 screwed Speccaton of Letters Patent.

on the side members 13 of the yoke. A retractor 19 is formed of a piece of wire, the terminal port-ions of which are formed into hooks 21 surrounding a cross-pin 22 connecting the two flat bars 12, while the middle portion of the wire is formed into a ring or loop to permit a nger to be applied thereto to pull the flat bars outward from the housing. Since the yoke cannot leave the housing while the pin 14 moves onthe side members of the yoke with the flat bars, the coiled springs 17 are compressed by said movement, and, upon tension being removed from the flat bars said springs restore the pivot pin 11 into the nearest notch of the rack. y

The forward ends of the iiat bars are pivotally connected by a bolt 24 to a bar 26 having at the rear end a handle 27. Pivoted on said bar, as shown at 28, is the forked upper end of a hook 29 which can engage a cross pin 31 between the two fiat bars. A rod 32 is pivotally attached, as shown at 33, to the other forked end of said hook, said rod passing n through a guideway 34 supported by the bar 26, and pivoted at its inner end to a lever 36 pivoted, as shown at 37, to the bar 26 and having a handle 38 extending at an acute angle with the handle 27. A spring 39 is coiled around the rod 32 between the guideway 34 and the lever 36 and is compressed by said lever 36 when the handle 38 is moved toward the handle 27, as by grasping both handles in one hand. Thereby the rod 32 is moved longitudinally forward and the lower end of the hook 29 is moved rearward out of engagement with the cross pin 31. At the same time the spring 39 is compressed. The forward end of said -bar 26 is rigidly secured or formed in one piece with the middle portion of a yoke 41, of which the terminal portions are pivoted on trunnions 42 extending from opposite sides of a collar 43, slidable upon a cylindrical body 44, the rear portion of which is received within the housing 1. The front end of the body has a socket 46 in which is receivedthe contracted cylindrical rear end 47 of a rivet holder 48, the main portion of which is frusto-conical in form, its forward narrow end having a frusto-conical socket 49, to receive a correspondingly shaped head of a rivet 51. A spring 52 is coiled around the body and is compressed between the slidable collar 43 and a flange 53 formed on the front end of the body. A collar 54 is secured by a set screw 56 around the body to retain the collar d3 in its position upon the body. ln the rear end of the body is screwedthe front end of a rod 57, upon the rear end ot which a collar 58 is retained by a nut 59 screwed upon said rear end. rod'is` a cylindrical bloclr 61 and between said block and collar V5S is a compressed coiled spring 62.

The Jfollowing is the mode of use of my improved rivet `holding instrument. rEhe operator ot the instrument adjusts the instrument in place so that the tube et rests against a bulkhead G or other abutment, while the iront end of the rivet holder t8 is adjacent to the hole through which the rivet is to be driven, but spaced therefrom a sutcient distanceytoallow the rivet to be placed in said hole. @When the red hot rivety has been placed by an attendant in said hole, the operator, having lirst grasped both handles 27 and BS'with the saine hand so as to withdraw the hooi; 29` from the pin 31, presses the handle Q7 toward ythe housingV 1 and thereby moves the rivet holder to a position such that its soclreted frontend abuts against the head of the rivet, at the same time comy He then releases handle 3S so that the oressinOA the sorinG' 52.

his Grasa u von the hook 29 is caused by 4the spring 39 to engage the 'cross pin 31, thereby preventing` the bar 26 from moving away from the housing 1 and holding the collar d3 in the proper position to compress the spring so that the rivet head is now held in its posit-ion against a plate 63 containing the rivet hole by the pressure oi' said spring.Y The attendant now swages the end of the rivet projecting through said hole securing the rivet in position. ll`he operator then again grasps both handles 27 and 38, withdrawing the hoolr troni the cross pin and allowing the bar 26 and the iiat bars 1Q to move outwardly trom the housing, thereby withdrawing the rivet Vholder from its position around the rivet head. Y

Wit-h each blow of the hammer upon the rivet there is also imparted to the rivet holder and bodyy a momentum which is also imparted to the'cylindrical block G1. This block, being loose, and its rearward movenient being only opposed by the pressure of the coiled spring; 52, moves slightly rearward, momentarily compressing said spring 62, and returning again under the increased pressure o' said spring and imparting `its forwardmomentum to the body ad and rivet holder d8, thereby imparting a orward blow to the rivet head, tending to press said rivet head against the Vplate 63.

rhe pressure of the spring y 52 may be varied by varying the notch ,9 in `the rack T whichis engaged by `the pivot 'pin 11. To adjust the pivot pin 11 in the racl; to vary said pressure, it it is required to increase Around said Leens/e the pressure, all that is necessary is to move the flat bars 12 forwardly, :tor by such y movement the-cross pinfis drawn orwvardlyV against the pressure of the springs 19 over the rear surface ot the tooth in fron-t of the notch in which it is engaged and then drops under such pressure into the nent notch in advance,rand so on, until the desired notch is reached. But it it be desired to reduce the pressure, then the pivot-pin 11 must be. withdrawn :trom the notch by pulling out the rear ends ot the flat bars 12 by ineansof the retract-or 19 whereupon the cross lpin can be moved rearwardly and dropped into any` notch kthat may be desired. 3g Y l vclaim1 1. ln a rivet holding instrument, the combination of a housing, a body'slidable therein, means carried bythe t'ront endet said body tor holding a rivet, acollar slidable upon the body, a bar the Jfrontend or which is pivotally connected `to said collar, a second. bar pivotally coiraectedl at its frontA endto said iirsl-iianied barpthe rear end oi' said bar being supported :by the housing, a spring. coiled around said body andcompressed be.- tween the colla-r and a portion ot the body, and detachable means tor-'securing together the two bars at an acute angle withy each other. i

2. ln a rivet holding instru1nent,the combination ot a housing, a body slidable therein, means carried by the `frontend 4kotsaid body Jtor holding a rivet, collar slidable c upon the body, a bar the front end of is pivot-ally connected .to said collar, a `seoond bar pivotally connected at itsfront end to said inist-named bar, the rear end ofsaid bar beingsupported by thehousing, aspring coiled around twee-n the collar and aportion of the' body, detachable means for securing together'the two bars at an acute angle with eachother, a hammer bloclr inovably attached to said WlilCll said bodyand compressed bei body and a spring Jior holding 'said ham; 110

mer block to lsaid body.

3. ln a rivet-holding instrument, the com i bination of a housing, a body slidable therein, a rivet holder carried by theifront end of said body, a `collar slidable upon the1 115 body and having trunnions, axbarV the'tront end of which is yoke-shaped andlpivotally engages said trunnions, a second bar pivotally connected at its iront end to saidfilirstnamed bar, the rear adjustably supported by the housing, a spring coiled around said 'body and"com pressed between the collar and a portion of the body,'and detachable means for securing end of said bar being together thetwobars at an acute angle with each other. n

a, ln a rivet `holding instrument, the cornbination oi' a housing, a bodyl slidable therein, mea-ns carried by thefrontend of said body for holding a rivet,- a collar slidablev upon the body, a bar the front end of which is pivotally connected to said collar, a second bar pivotally connected at its front end to said first-named bar, the rear end of said bar being supported by the housing, a `spring coiled around said body and compressed be-. tween the collar and a portion of the body, a rack carried by the housing, a bar pivotally connected at its front end to the aforesaid bar, a pivot pin carried by the rear end of said last-recited bar and adapted to engage any one of the notches in the rack, a

pin extending from said last-recited bar, a hook pivoted to the first-named bar and' adapted to engage said pin, a rod pivotally connected to said hook to vibrate the same on its pivot, a spring for moving the rod in the direction in which said hook engages said pin, a handle for moving said hook in the opposite direction, and means for yieldingly pressing said pin into engagement With a notch of said rack.

GEO. s. MoNsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

